1. Arthropod Notes

2. Arthropod Characteristics
“anthron” = joint
“podos” = foot
segmented body
tough exoskeleton
jointed appendages.

3. Growth Exoskeleton – suit of armor that protects
and supports the body.
Molting:
Skin glands digest inner part of exoskeleton. Other glands make a new skeleton
Animal sheds old exoskeleton.
While the new exoskeleton is soft, the animal fills with air or fluid to allow room for growth before skeleton hardens.

4. Life Functions Respiration Feather-like gills Circulation
Open circulatory system
Response
Brain/sophisticated sense organs
Movement
Muscles

5. 1. Crustaceans Examples: shrimp, crabs and lobsters. 150,000 species.
2 pairs of branched antennae
2 or 3 body sections
Chewing mouthparts.
Dominate group of arthropods in the ocean.
Coconut crab

6. 2. Horseshoe Crabs living fossil Blue blood because
it has copper in it.
200 flattened gills
(book gills)
The medical profession uses an extract from the horseshoe crab's blue, copper-based blood called lysate to test the purity of medicines
the tail is used to plow the crab through the sand, to act as a rudder, and to right the crab when it accidentally tips over.
Female lays 20,000 eggs in the sand and the male fertilizes them.

7. 3. Sea Spiders Sea Spiders – feed on sea anemones Most are tiny and
crawl on sessile
plants and
animals.

8. 4. Insects
dominate group of arthropods on land